Targeting allostery in the Dynein motor domain with small molecule inhibitors.

Targeting allostery in the Dynein motor domain with small molecule inhibitors.
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DOI:
10.1016/j.chembiol.2021.04.024
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发表时间:
2021-10-21
影响因子:
8.6
通讯作者:
Kapoor TM
Kapoor TM
中科院分区:
生物学1区
文献类型:
--
作者:
Santarossa CC;Mickolajczyk KJ;Steinman JB;Urnavicius L;Chen N;Hirata Y;Fukase Y;Coudray N;Ekiert DC;Bhabha G;Kapoor TM

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Cytoplasmic dyneins are AAA (ATPase associated with diverse cellular activities) motor proteins responsible for microtubule minus-end-directed intracellular transport. Dynein’s unusually large size, four distinct nucleotide-binding sites, and conformational dynamics pose challenges for the design of potent and selective chemical inhibitors. Here we use structural approaches to develop a model for the inhibition of a well-characterized S. cerevisiae dynein construct by pyrazolo-pyrimidinone-based compounds. These data, along with functional assays of dynein motility and mutagenesis studies, suggest that the compounds inhibit dynein by engaging the regulatory ATPase sites in the AAA3 and AAA4 domains, and not by interacting with dynein’s main catalytic site in the AAA1 domain. A double Walker B mutant in AAA3 and AAA4 is an inactive enzyme, suggesting that inhibiting these regulatory sites can have a similar effect to chemically inhibiting AAA1. Our findings reveal how chemical inhibitors can be designed to disrupt allosteric communication across dynein’s AAA domains. Santarossa et al. describe a pyrazolo-pyrimidinone-based compound that targets two regulatory AAA domains in dynein to block its motility. These data show that the AAA3 and AAA4 domains of dynein are druggable sites and provide a framework that can guide inhibitor optimization.
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